| public GetSubstringAt ( int position, int length ) : string | ||
| position | int | |
| length | int | |
| return | string | |
private static int Get3CharOrShorterOperatorLength(CharacterStream cs) {
if (cs.DistanceFromEnd >= 3) {
string threeLetterCandidate = cs.GetSubstringAt(cs.Position, 3);
if (threeLetterCandidate.Length == 3) {
int index = Array.BinarySearch<string>(_threeChars, threeLetterCandidate);
if (index >= 0) {
return 3;
}
}
}
return Get2CharOrShorterOperatorLength(cs);
}
internal static int Get2CharOrShorterOperatorLength(CharacterStream cs) {
if (cs.DistanceFromEnd >= 2) {
string twoLetterCandidate = cs.GetSubstringAt(cs.Position, 2);
if (twoLetterCandidate.Length == 2) {
int index = Array.BinarySearch<string>(_twoChars, twoLetterCandidate);
if (index >= 0) {
return 2;
}
}
}
return GetSingleCharOperatorLength(cs.CurrentChar);
}
private static bool IsValidDouble(CharacterStream cs, int start, int end) {
int len = end - start;
string s = cs.GetSubstringAt(start, len);
double n;
return Double.TryParse(s, NumberStyles.Number | NumberStyles.AllowExponent, CultureInfo.InvariantCulture, out n);
}